The Norse Earldom was frequently under joint rule. The possessions of the Earldom included the Mormaerdom of Caithness and, until 1194, the Shetland Islands.
(listed here in chronological order, dates approximate; links to individuals in this report.)

Persons of Note

Principal Sources

This is not a complete list of my Viking sources;
See the Sources button, above,
for the complete detailed list of all 8 of those.
Use the Annex button to see individual citations (and other notes).
Use the book icon link
()
to see details about a particular source.
They are listed here in relevance order;
i.e. the first had the most citations.

Tim; "Missouri Mule"

BARNES-GRAHAM, Peter; "Stirnet Genealogy"

Surname Inventory

These are the surnames found in this page.
33 Surnames: (7 frequent fliers highlighted.)
My families (2) are underscored, with links to those pages.
Other names than mine, of course, have no link.
(Patronymics, e.g. DUNCANSDATTER, treated as surnames.)